- isBase64Image(str?): str is `data:image/gif;base64,${string}` | `data:image/jpeg;base64,${string}` | `data:image/jpg;base64,${string}` | `data:image/png;base64,${string}` | `data:image/svg+xml;base64,${string}` | `data:image/webp;base64,${string}`
Returns str is `data:image/gif;base64,${string}` | `data:image/jpeg;base64,${string}` | `data:image/jpg;base64,${string}` | `data:image/png;base64,${string}` | `data:image/svg+xml;base64,${string}` | `data:image/webp;base64,${string}`
check of the provided string is a base64 string, by simply observing if it starts with
"data:image/"